3v4l.org

run code in 300+ PHP versions simultaneously
<?php define('TRUE', false); var_dump(TRUE); $a = 0; var_dump('' == $a and 'a' == $a and '' === (string)$a and 'a' === (string)$a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Constant TRUE already defined in /in/cbkt3 on line 2 bool(true) bool(false)
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
bool(true) bool(false)
preferences:
308.53 ms | 403 KiB | 376 Q